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AIXpert Blog is about the AIX operating system from IBM running on POWER based machines called Power Systems and software related to it like PowerVM for virtualisation, PowerVC for Deploying VM's and PowerSC for security plus performance monitoring and nmon

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Recovering a Failed VIO Disk

Here is a recovery procedure for replacing a failed client disk on a Virtual IO server. It assumes the client partitions have mirrored (virtual) disks. The recovery involves both the VIO server and its client partitions. However, it is non disruptive for the client partitions (no downtime), and may be non disruptive on the VIO server (depending on disk configuration). Thisprocedure does not apply to Raid5 or SAN disk failures.

The test system had two VIO servers and an AIX client. The AIX client had two virtual disks (one disk from each VIO server). The two virtual disks were mirrored in the client using AIX's mirrorvg. (The procedure would be the same on a single VIO server with two disks.)

The software levels were:

p520: Firmware SF230_145 VIO Version 1.2.0 Client: AIX 5.3 ML3

I simulated the disk failure by removing the client LV on one VIO server. The padmin commands to simulate the failure were: